Strap for Day-Date 40 Yellow Gold - Baguette / Paved

The lug width of the Day-Date 40 228398TBR-0036 is precisely 20 millimetres. This measurement represents the internal distance between the lugs where the strap attaches to the case. Verification of this specification is essential before purchasing an aftermarket strap, as even minor variations would result in unsightly gaps between the lugs and case or compromised spring bar geometry.

Alligator leather finished with vegetable tanning represents the finest aesthetic choice for the Day-Date 40 in yellow gold: the natural grain visually complements the case lines and develops a patina over time that ages harmoniously with the gold. Alternatively, calf leather offers a smoother surface whilst maintaining superior elasticity, whereas shell cordovan delivers exceptional structural density and moisture absorption for those seeking artisanal durability.

The strap is replaced by removing the spring bars that connect through the case lugs. Use a spring bar tool to compress the internal spring mechanism of the bar and extract it, then thread the new strap through the lugs. It is advisable to engage an authorised service centre or trusted watchmaker to prevent case damage during this operation.

Yes, a 20mm artisanal strap is fully compatible from a dimensional perspective. Aesthetic compatibility depends on your choice of material and finish: natural alligator, calf, shell cordovan and high-density rubber all pair perfectly with the yellow gold case profile. Compatibility is guaranteed by precise lug width matching and superior construction quality of the spring bar slots.

A high-quality artisanal leather strap (alligator, calf, shell cordovan) typically lasts 3-5 years under moderate daily wear. Longevity depends on exposure to humidity, perspiration and ultraviolet radiation. Vegetable tanning naturally develops a protective patina over time that slows ageing. High-density rubber straps maintain structural integrity for 5-7 years. Casati Milano provides an 18-month warranty on manufacturing defects, though preventative care (gentle cleaning, air drying) extends functional lifespan considerably.